<?php

namespace GetId3\Module\Misc;

use GetId3\Handler\BaseHandler;
use GetId3\Lib\Helper;

/////////////////////////////////////////////////////////////////
/// GetId3() by James Heinrich <info@getid3.org>               //
//  available at http://getid3.sourceforge.net                 //
//            or http://www.getid3.org                         //
/////////////////////////////////////////////////////////////////
// See readme.txt for more details                             //
/////////////////////////////////////////////////////////////////
//                                                             //
// module.misc.iso.php                                         //
// module for analyzing ISO files                              //
// dependencies: NONE                                          //
//                                                            ///
/////////////////////////////////////////////////////////////////

/**
 * module for analyzing ISO files
 *
 * @author James Heinrich <info@getid3.org>
 *
 * @link http://getid3.sourceforge.net
 * @link http://www.getid3.org
 */
class Iso extends BaseHandler
{
    /**
     * @return bool
     */
    public function analyze()
    {
        $info = &$this->getid3->info;

        $info['fileformat'] = 'iso';

        for ($i = 16; $i <= 19; ++$i) {
            fseek($this->getid3->fp, 2048 * $i, SEEK_SET);
            $ISOheader = fread($this->getid3->fp, 2048);
            if (substr($ISOheader, 1, 5) == 'CD001') {
                switch (ord($ISOheader{0})) {
                    case 1:
                        $info['iso']['primary_volume_descriptor']['offset'] = 2048 * $i;
                        $this->ParsePrimaryVolumeDescriptor($ISOheader);
                        break;

                    case 2:
                        $info['iso']['supplementary_volume_descriptor']['offset'] = 2048 * $i;
                        $this->ParseSupplementaryVolumeDescriptor($ISOheader);
                        break;

                    default:
                        // skip
                        break;
                }
            }
        }

        $this->ParsePathTable();

        $info['iso']['files'] = array();
        foreach ($info['iso']['path_table']['directories'] as $directorynum => $directorydata) {
            $info['iso']['directories'][$directorynum] = $this->ParseDirectoryRecord($directorydata);
        }

        return true;
    }

    /**
     * @param  type    $ISOheader
     *
     * @return bool
     */
    public function ParsePrimaryVolumeDescriptor(&$ISOheader)
    {
        // ISO integer values are stored *BOTH* Little-Endian AND Big-Endian format!!
        // ie 12345 == 0x3039  is stored as $39 $30 $30 $39 in a 4-byte field

        // shortcuts
        $info = &$this->getid3->info;
        $info['iso']['primary_volume_descriptor']['raw'] = array();
        $thisfile_iso_primaryVD = &$info['iso']['primary_volume_descriptor'];
        $thisfile_iso_primaryVD_raw = &$thisfile_iso_primaryVD['raw'];

        $thisfile_iso_primaryVD_raw['volume_descriptor_type'] = Helper::LittleEndian2Int(substr($ISOheader, 0, 1));
        $thisfile_iso_primaryVD_raw['standard_identifier'] = substr($ISOheader, 1, 5);
        if ($thisfile_iso_primaryVD_raw['standard_identifier'] != 'CD001') {
            $info['error'][] = 'Expected "CD001" at offset ('.($thisfile_iso_primaryVD['offset'] + 1).'), found "'.$thisfile_iso_primaryVD_raw['standard_identifier'].'" instead';
            unset($info['fileformat']);
            unset($info['iso']);

            return false;
        }

        $thisfile_iso_primaryVD_raw['volume_descriptor_version'] = Helper::LittleEndian2Int(substr($ISOheader, 6, 1));
        //$thisfile_iso_primaryVD_raw['unused_1']                      =                              substr($ISOheader,    7, 1);
        $thisfile_iso_primaryVD_raw['system_identifier'] = substr($ISOheader, 8, 32);
        $thisfile_iso_primaryVD_raw['volume_identifier'] = substr($ISOheader, 40, 32);
        //$thisfile_iso_primaryVD_raw['unused_2']                      =                              substr($ISOheader,   72, 8);
        $thisfile_iso_primaryVD_raw['volume_space_size'] = Helper::LittleEndian2Int(substr($ISOheader, 80, 4));
        //$thisfile_iso_primaryVD_raw['unused_3']                      =                              substr($ISOheader,   88, 32);
        $thisfile_iso_primaryVD_raw['volume_set_size'] = Helper::LittleEndian2Int(substr($ISOheader, 120, 2));
        $thisfile_iso_primaryVD_raw['volume_sequence_number'] = Helper::LittleEndian2Int(substr($ISOheader, 124, 2));
        $thisfile_iso_primaryVD_raw['logical_block_size'] = Helper::LittleEndian2Int(substr($ISOheader, 128, 2));
        $thisfile_iso_primaryVD_raw['path_table_size'] = Helper::LittleEndian2Int(substr($ISOheader, 132, 4));
        $thisfile_iso_primaryVD_raw['path_table_l_location'] = Helper::LittleEndian2Int(substr($ISOheader, 140, 2));
        $thisfile_iso_primaryVD_raw['path_table_l_opt_location'] = Helper::LittleEndian2Int(substr($ISOheader, 144, 2));
        $thisfile_iso_primaryVD_raw['path_table_m_location'] = Helper::LittleEndian2Int(substr($ISOheader, 148, 2));
        $thisfile_iso_primaryVD_raw['path_table_m_opt_location'] = Helper::LittleEndian2Int(substr($ISOheader, 152, 2));
        $thisfile_iso_primaryVD_raw['root_directory_record'] = substr($ISOheader, 156, 34);
        $thisfile_iso_primaryVD_raw['volume_set_identifier'] = substr($ISOheader, 190, 128);
        $thisfile_iso_primaryVD_raw['publisher_identifier'] = substr($ISOheader, 318, 128);
        $thisfile_iso_primaryVD_raw['data_preparer_identifier'] = substr($ISOheader, 446, 128);
        $thisfile_iso_primaryVD_raw['application_identifier'] = substr($ISOheader, 574, 128);
        $thisfile_iso_primaryVD_raw['copyright_file_identifier'] = substr($ISOheader, 702, 37);
        $thisfile_iso_primaryVD_raw['abstract_file_identifier'] = substr($ISOheader, 739, 37);
        $thisfile_iso_primaryVD_raw['bibliographic_file_identifier'] = substr($ISOheader, 776, 37);
        $thisfile_iso_primaryVD_raw['volume_creation_date_time'] = substr($ISOheader, 813, 17);
        $thisfile_iso_primaryVD_raw['volume_modification_date_time'] = substr($ISOheader, 830, 17);
        $thisfile_iso_primaryVD_raw['volume_expiration_date_time'] = substr($ISOheader, 847, 17);
        $thisfile_iso_primaryVD_raw['volume_effective_date_time'] = substr($ISOheader, 864, 17);
        $thisfile_iso_primaryVD_raw['file_structure_version'] = Helper::LittleEndian2Int(substr($ISOheader, 881, 1));
        //$thisfile_iso_primaryVD_raw['unused_4']                      = GetId3_lib::LittleEndian2Int(substr($ISOheader,  882, 1));
        $thisfile_iso_primaryVD_raw['application_data'] = substr($ISOheader, 883, 512);
        //$thisfile_iso_primaryVD_raw['unused_5']                      =                              substr($ISOheader, 1395, 653);

        $thisfile_iso_primaryVD['system_identifier'] = trim($thisfile_iso_primaryVD_raw['system_identifier']);
        $thisfile_iso_primaryVD['volume_identifier'] = trim($thisfile_iso_primaryVD_raw['volume_identifier']);
        $thisfile_iso_primaryVD['volume_set_identifier'] = trim($thisfile_iso_primaryVD_raw['volume_set_identifier']);
        $thisfile_iso_primaryVD['publisher_identifier'] = trim($thisfile_iso_primaryVD_raw['publisher_identifier']);
        $thisfile_iso_primaryVD['data_preparer_identifier'] = trim($thisfile_iso_primaryVD_raw['data_preparer_identifier']);
        $thisfile_iso_primaryVD['application_identifier'] = trim($thisfile_iso_primaryVD_raw['application_identifier']);
        $thisfile_iso_primaryVD['copyright_file_identifier'] = trim($thisfile_iso_primaryVD_raw['copyright_file_identifier']);
        $thisfile_iso_primaryVD['abstract_file_identifier'] = trim($thisfile_iso_primaryVD_raw['abstract_file_identifier']);
        $thisfile_iso_primaryVD['bibliographic_file_identifier'] = trim($thisfile_iso_primaryVD_raw['bibliographic_file_identifier']);
        $thisfile_iso_primaryVD['volume_creation_date_time'] = $this->ISOtimeText2UNIXtime($thisfile_iso_primaryVD_raw['volume_creation_date_time']);
        $thisfile_iso_primaryVD['volume_modification_date_time'] = $this->ISOtimeText2UNIXtime($thisfile_iso_primaryVD_raw['volume_modification_date_time']);
        $thisfile_iso_primaryVD['volume_expiration_date_time'] = $this->ISOtimeText2UNIXtime($thisfile_iso_primaryVD_raw['volume_expiration_date_time']);
        $thisfile_iso_primaryVD['volume_effective_date_time'] = $this->ISOtimeText2UNIXtime($thisfile_iso_primaryVD_raw['volume_effective_date_time']);

        if (($thisfile_iso_primaryVD_raw['volume_space_size'] * 2048) > $info['filesize']) {
            $info['error'][] = 'Volume Space Size ('.($thisfile_iso_primaryVD_raw['volume_space_size'] * 2048).' bytes) is larger than the file size ('.$info['filesize'].' bytes) (truncated file?)';
        }

        return true;
    }

    /**
     * @param  type    $ISOheader
     *
     * @return bool
     */
    public function ParseSupplementaryVolumeDescriptor(&$ISOheader)
    {
        // ISO integer values are stored Both-Endian format!!
        // ie 12345 == 0x3039  is stored as $39 $30 $30 $39 in a 4-byte field

        // shortcuts
        $info = &$this->getid3->info;
        $info['iso']['supplementary_volume_descriptor']['raw'] = array();
        $thisfile_iso_supplementaryVD = &$info['iso']['supplementary_volume_descriptor'];
        $thisfile_iso_supplementaryVD_raw = &$thisfile_iso_supplementaryVD['raw'];

        $thisfile_iso_supplementaryVD_raw['volume_descriptor_type'] = Helper::LittleEndian2Int(substr($ISOheader, 0, 1));
        $thisfile_iso_supplementaryVD_raw['standard_identifier'] = substr($ISOheader, 1, 5);
        if ($thisfile_iso_supplementaryVD_raw['standard_identifier'] != 'CD001') {
            $info['error'][] = 'Expected "CD001" at offset ('.($thisfile_iso_supplementaryVD['offset'] + 1).'), found "'.$thisfile_iso_supplementaryVD_raw['standard_identifier'].'" instead';
            unset($info['fileformat']);
            unset($info['iso']);

            return false;
        }

        $thisfile_iso_supplementaryVD_raw['volume_descriptor_version'] = Helper::LittleEndian2Int(substr($ISOheader, 6, 1));
        //$thisfile_iso_supplementaryVD_raw['unused_1']                  =                              substr($ISOheader,    7, 1);
        $thisfile_iso_supplementaryVD_raw['system_identifier'] = substr($ISOheader, 8, 32);
        $thisfile_iso_supplementaryVD_raw['volume_identifier'] = substr($ISOheader, 40, 32);
        //$thisfile_iso_supplementaryVD_raw['unused_2']                  =                              substr($ISOheader,   72, 8);
        $thisfile_iso_supplementaryVD_raw['volume_space_size'] = Helper::LittleEndian2Int(substr($ISOheader, 80, 4));
        if ($thisfile_iso_supplementaryVD_raw['volume_space_size'] == 0) {
            // Supplementary Volume Descriptor not used
            //unset($thisfile_iso_supplementaryVD);
            //return false;
        }

        //$thisfile_iso_supplementaryVD_raw['unused_3']                       =                              substr($ISOheader,   88, 32);
        $thisfile_iso_supplementaryVD_raw['volume_set_size'] = Helper::LittleEndian2Int(substr($ISOheader, 120, 2));
        $thisfile_iso_supplementaryVD_raw['volume_sequence_number'] = Helper::LittleEndian2Int(substr($ISOheader, 124, 2));
        $thisfile_iso_supplementaryVD_raw['logical_block_size'] = Helper::LittleEndian2Int(substr($ISOheader, 128, 2));
        $thisfile_iso_supplementaryVD_raw['path_table_size'] = Helper::LittleEndian2Int(substr($ISOheader, 132, 4));
        $thisfile_iso_supplementaryVD_raw['path_table_l_location'] = Helper::LittleEndian2Int(substr($ISOheader, 140, 2));
        $thisfile_iso_supplementaryVD_raw['path_table_l_opt_location'] = Helper::LittleEndian2Int(substr($ISOheader, 144, 2));
        $thisfile_iso_supplementaryVD_raw['path_table_m_location'] = Helper::LittleEndian2Int(substr($ISOheader, 148, 2));
        $thisfile_iso_supplementaryVD_raw['path_table_m_opt_location'] = Helper::LittleEndian2Int(substr($ISOheader, 152, 2));
        $thisfile_iso_supplementaryVD_raw['root_directory_record'] = substr($ISOheader, 156, 34);
        $thisfile_iso_supplementaryVD_raw['volume_set_identifier'] = substr($ISOheader, 190, 128);
        $thisfile_iso_supplementaryVD_raw['publisher_identifier'] = substr($ISOheader, 318, 128);
        $thisfile_iso_supplementaryVD_raw['data_preparer_identifier'] = substr($ISOheader, 446, 128);
        $thisfile_iso_supplementaryVD_raw['application_identifier'] = substr($ISOheader, 574, 128);
        $thisfile_iso_supplementaryVD_raw['copyright_file_identifier'] = substr($ISOheader, 702, 37);
        $thisfile_iso_supplementaryVD_raw['abstract_file_identifier'] = substr($ISOheader, 739, 37);
        $thisfile_iso_supplementaryVD_raw['bibliographic_file_identifier'] = substr($ISOheader, 776, 37);
        $thisfile_iso_supplementaryVD_raw['volume_creation_date_time'] = substr($ISOheader, 813, 17);
        $thisfile_iso_supplementaryVD_raw['volume_modification_date_time'] = substr($ISOheader, 830, 17);
        $thisfile_iso_supplementaryVD_raw['volume_expiration_date_time'] = substr($ISOheader, 847, 17);
        $thisfile_iso_supplementaryVD_raw['volume_effective_date_time'] = substr($ISOheader, 864, 17);
        $thisfile_iso_supplementaryVD_raw['file_structure_version'] = Helper::LittleEndian2Int(substr($ISOheader, 881, 1));
        //$thisfile_iso_supplementaryVD_raw['unused_4']                       = GetId3_lib::LittleEndian2Int(substr($ISOheader,  882, 1));
        $thisfile_iso_supplementaryVD_raw['application_data'] = substr($ISOheader, 883, 512);
        //$thisfile_iso_supplementaryVD_raw['unused_5']                       =                              substr($ISOheader, 1395, 653);

        $thisfile_iso_supplementaryVD['system_identifier'] = trim($thisfile_iso_supplementaryVD_raw['system_identifier']);
        $thisfile_iso_supplementaryVD['volume_identifier'] = trim($thisfile_iso_supplementaryVD_raw['volume_identifier']);
        $thisfile_iso_supplementaryVD['volume_set_identifier'] = trim($thisfile_iso_supplementaryVD_raw['volume_set_identifier']);
        $thisfile_iso_supplementaryVD['publisher_identifier'] = trim($thisfile_iso_supplementaryVD_raw['publisher_identifier']);
        $thisfile_iso_supplementaryVD['data_preparer_identifier'] = trim($thisfile_iso_supplementaryVD_raw['data_preparer_identifier']);
        $thisfile_iso_supplementaryVD['application_identifier'] = trim($thisfile_iso_supplementaryVD_raw['application_identifier']);
        $thisfile_iso_supplementaryVD['copyright_file_identifier'] = trim($thisfile_iso_supplementaryVD_raw['copyright_file_identifier']);
        $thisfile_iso_supplementaryVD['abstract_file_identifier'] = trim($thisfile_iso_supplementaryVD_raw['abstract_file_identifier']);
        $thisfile_iso_supplementaryVD['bibliographic_file_identifier'] = trim($thisfile_iso_supplementaryVD_raw['bibliographic_file_identifier']);
        $thisfile_iso_supplementaryVD['volume_creation_date_time'] = $this->ISOtimeText2UNIXtime($thisfile_iso_supplementaryVD_raw['volume_creation_date_time']);
        $thisfile_iso_supplementaryVD['volume_modification_date_time'] = $this->ISOtimeText2UNIXtime($thisfile_iso_supplementaryVD_raw['volume_modification_date_time']);
        $thisfile_iso_supplementaryVD['volume_expiration_date_time'] = $this->ISOtimeText2UNIXtime($thisfile_iso_supplementaryVD_raw['volume_expiration_date_time']);
        $thisfile_iso_supplementaryVD['volume_effective_date_time'] = $this->ISOtimeText2UNIXtime($thisfile_iso_supplementaryVD_raw['volume_effective_date_time']);

        if (($thisfile_iso_supplementaryVD_raw['volume_space_size'] * $thisfile_iso_supplementaryVD_raw['logical_block_size']) > $info['filesize']) {
            $info['error'][] = 'Volume Space Size ('.($thisfile_iso_supplementaryVD_raw['volume_space_size'] * $thisfile_iso_supplementaryVD_raw['logical_block_size']).' bytes) is larger than the file size ('.$info['filesize'].' bytes) (truncated file?)';
        }

        return true;
    }

    /**
     * @return bool
     */
    public function ParsePathTable()
    {
        $info = &$this->getid3->info;
        if (!isset($info['iso']['supplementary_volume_descriptor']['raw']['path_table_l_location']) && !isset($info['iso']['primary_volume_descriptor']['raw']['path_table_l_location'])) {
            return false;
        }
        if (isset($info['iso']['supplementary_volume_descriptor']['raw']['path_table_l_location'])) {
            $PathTableLocation = $info['iso']['supplementary_volume_descriptor']['raw']['path_table_l_location'];
            $PathTableSize = $info['iso']['supplementary_volume_descriptor']['raw']['path_table_size'];
            $TextEncoding = 'UTF-16BE'; // Big-Endian Unicode
        } else {
            $PathTableLocation = $info['iso']['primary_volume_descriptor']['raw']['path_table_l_location'];
            $PathTableSize = $info['iso']['primary_volume_descriptor']['raw']['path_table_size'];
            $TextEncoding = 'ISO-8859-1'; // Latin-1
        }

        if (($PathTableLocation * 2048) > $info['filesize']) {
            $info['error'][] = 'Path Table Location specifies an offset ('.($PathTableLocation * 2048).') beyond the end-of-file ('.$info['filesize'].')';

            return false;
        }

        $info['iso']['path_table']['offset'] = $PathTableLocation * 2048;
        fseek($this->getid3->fp, $info['iso']['path_table']['offset'], SEEK_SET);
        $info['iso']['path_table']['raw'] = fread($this->getid3->fp, $PathTableSize);

        $offset = 0;
        $pathcounter = 1;
        while ($offset < $PathTableSize) {
            // shortcut
            $info['iso']['path_table']['directories'][$pathcounter] = array();
            $thisfile_iso_pathtable_directories_current = &$info['iso']['path_table']['directories'][$pathcounter];

            $thisfile_iso_pathtable_directories_current['length'] = Helper::LittleEndian2Int(substr($info['iso']['path_table']['raw'], $offset, 1));
            $offset += 1;
            $thisfile_iso_pathtable_directories_current['extended_length'] = Helper::LittleEndian2Int(substr($info['iso']['path_table']['raw'], $offset, 1));
            $offset += 1;
            $thisfile_iso_pathtable_directories_current['location_logical'] = Helper::LittleEndian2Int(substr($info['iso']['path_table']['raw'], $offset, 4));
            $offset += 4;
            $thisfile_iso_pathtable_directories_current['parent_directory'] = Helper::LittleEndian2Int(substr($info['iso']['path_table']['raw'], $offset, 2));
            $offset += 2;
            $thisfile_iso_pathtable_directories_current['name'] = substr($info['iso']['path_table']['raw'], $offset, $thisfile_iso_pathtable_directories_current['length']);
            $offset += $thisfile_iso_pathtable_directories_current['length'] + ($thisfile_iso_pathtable_directories_current['length'] % 2);

            $thisfile_iso_pathtable_directories_current['name_ascii'] = Helper::iconv_fallback($TextEncoding, $info['encoding'], $thisfile_iso_pathtable_directories_current['name']);

            $thisfile_iso_pathtable_directories_current['location_bytes'] = $thisfile_iso_pathtable_directories_current['location_logical'] * 2048;
            if ($pathcounter == 1) {
                $thisfile_iso_pathtable_directories_current['full_path'] = '/';
            } else {
                $thisfile_iso_pathtable_directories_current['full_path'] = $info['iso']['path_table']['directories'][$thisfile_iso_pathtable_directories_current['parent_directory']]['full_path'].$thisfile_iso_pathtable_directories_current['name_ascii'].'/';
            }
            $FullPathArray[] = $thisfile_iso_pathtable_directories_current['full_path'];

            ++$pathcounter;
        }

        return true;
    }

    /**
     * @param  type   $directorydata
     *
     * @return string
     */
    public function ParseDirectoryRecord($directorydata)
    {
        $info = &$this->getid3->info;
        if (isset($info['iso']['supplementary_volume_descriptor'])) {
            $TextEncoding = 'UTF-16BE';   // Big-Endian Unicode
        } else {
            $TextEncoding = 'ISO-8859-1'; // Latin-1
        }

        fseek($this->getid3->fp, $directorydata['location_bytes'], SEEK_SET);
        $DirectoryRecordData = fread($this->getid3->fp, 1);

        while (ord($DirectoryRecordData{0}) > 33) {
            $DirectoryRecordData .= fread($this->getid3->fp, ord($DirectoryRecordData{0}) - 1);

            $ThisDirectoryRecord['raw']['length'] = Helper::LittleEndian2Int(substr($DirectoryRecordData, 0, 1));
            $ThisDirectoryRecord['raw']['extended_attribute_length'] = Helper::LittleEndian2Int(substr($DirectoryRecordData, 1, 1));
            $ThisDirectoryRecord['raw']['offset_logical'] = Helper::LittleEndian2Int(substr($DirectoryRecordData, 2, 4));
            $ThisDirectoryRecord['raw']['filesize'] = Helper::LittleEndian2Int(substr($DirectoryRecordData, 10, 4));
            $ThisDirectoryRecord['raw']['recording_date_time'] = substr($DirectoryRecordData, 18, 7);
            $ThisDirectoryRecord['raw']['file_flags'] = Helper::LittleEndian2Int(substr($DirectoryRecordData, 25, 1));
            $ThisDirectoryRecord['raw']['file_unit_size'] = Helper::LittleEndian2Int(substr($DirectoryRecordData, 26, 1));
            $ThisDirectoryRecord['raw']['interleave_gap_size'] = Helper::LittleEndian2Int(substr($DirectoryRecordData, 27, 1));
            $ThisDirectoryRecord['raw']['volume_sequence_number'] = Helper::LittleEndian2Int(substr($DirectoryRecordData, 28, 2));
            $ThisDirectoryRecord['raw']['file_identifier_length'] = Helper::LittleEndian2Int(substr($DirectoryRecordData, 32, 1));
            $ThisDirectoryRecord['raw']['file_identifier'] = substr($DirectoryRecordData, 33, $ThisDirectoryRecord['raw']['file_identifier_length']);

            $ThisDirectoryRecord['file_identifier_ascii'] = Helper::iconv_fallback($TextEncoding, $info['encoding'], $ThisDirectoryRecord['raw']['file_identifier']);

            $ThisDirectoryRecord['filesize'] = $ThisDirectoryRecord['raw']['filesize'];
            $ThisDirectoryRecord['offset_bytes'] = $ThisDirectoryRecord['raw']['offset_logical'] * 2048;
            $ThisDirectoryRecord['file_flags']['hidden'] = (bool) ($ThisDirectoryRecord['raw']['file_flags'] & 0x01);
            $ThisDirectoryRecord['file_flags']['directory'] = (bool) ($ThisDirectoryRecord['raw']['file_flags'] & 0x02);
            $ThisDirectoryRecord['file_flags']['associated'] = (bool) ($ThisDirectoryRecord['raw']['file_flags'] & 0x04);
            $ThisDirectoryRecord['file_flags']['extended'] = (bool) ($ThisDirectoryRecord['raw']['file_flags'] & 0x08);
            $ThisDirectoryRecord['file_flags']['permissions'] = (bool) ($ThisDirectoryRecord['raw']['file_flags'] & 0x10);
            $ThisDirectoryRecord['file_flags']['multiple'] = (bool) ($ThisDirectoryRecord['raw']['file_flags'] & 0x80);
            $ThisDirectoryRecord['recording_timestamp'] = $this->ISOtime2UNIXtime($ThisDirectoryRecord['raw']['recording_date_time']);

            if ($ThisDirectoryRecord['file_flags']['directory']) {
                $ThisDirectoryRecord['filename'] = $directorydata['full_path'];
            } else {
                $ThisDirectoryRecord['filename'] = $directorydata['full_path'].$this->ISOstripFilenameVersion($ThisDirectoryRecord['file_identifier_ascii']);
                $info['iso']['files'] = Helper::array_merge_clobber($info['iso']['files'], Helper::CreateDeepArray($ThisDirectoryRecord['filename'], '/', $ThisDirectoryRecord['filesize']));
            }

            $DirectoryRecord[] = $ThisDirectoryRecord;
            $DirectoryRecordData = fread($this->getid3->fp, 1);
        }

        return $DirectoryRecord;
    }

    /**
     * @param  type $ISOfilename
     *
     * @return type
     */
    public function ISOstripFilenameVersion($ISOfilename)
    {
        // convert 'filename.ext;1' to 'filename.ext'
        if (!strstr($ISOfilename, ';')) {
            return $ISOfilename;
        } else {
            return substr($ISOfilename, 0, strpos($ISOfilename, ';'));
        }
    }

    /**
     * @param  type    $ISOtime
     *
     * @return bool
     */
    public function ISOtimeText2UNIXtime($ISOtime)
    {
        $UNIXyear = (int) substr($ISOtime, 0, 4);
        $UNIXmonth = (int) substr($ISOtime, 4, 2);
        $UNIXday = (int) substr($ISOtime, 6, 2);
        $UNIXhour = (int) substr($ISOtime, 8, 2);
        $UNIXminute = (int) substr($ISOtime, 10, 2);
        $UNIXsecond = (int) substr($ISOtime, 12, 2);

        if (!$UNIXyear) {
            return false;
        }

        return gmmktime($UNIXhour, $UNIXminute, $UNIXsecond, $UNIXmonth, $UNIXday, $UNIXyear);
    }

    /**
     * @param  type $ISOtime
     *
     * @return type
     */
    public function ISOtime2UNIXtime($ISOtime)
    {
        // Represented by seven bytes:
        // 1: Number of years since 1900
        // 2: Month of the year from 1 to 12
        // 3: Day of the Month from 1 to 31
        // 4: Hour of the day from 0 to 23
        // 5: Minute of the hour from 0 to 59
        // 6: second of the minute from 0 to 59
        // 7: Offset from Greenwich Mean Time in number of 15 minute intervals from -48 (West) to +52 (East)

        $UNIXyear = ord($ISOtime{0}) + 1900;
        $UNIXmonth = ord($ISOtime{1});
        $UNIXday = ord($ISOtime{2});
        $UNIXhour = ord($ISOtime{3});
        $UNIXminute = ord($ISOtime{4});
        $UNIXsecond = ord($ISOtime{5});
        $GMToffset = $this->TwosCompliment2Decimal(ord($ISOtime{5}));

        return gmmktime($UNIXhour, $UNIXminute, $UNIXsecond, $UNIXmonth, $UNIXday, $UNIXyear);
    }

    /**
     * @param  type $BinaryValue
     *
     * @return type
     */
    public function TwosCompliment2Decimal($BinaryValue)
    {
        // http://sandbox.mc.edu/~bennet/cs110/tc/tctod.html
        // First check if the number is negative or positive by looking at the sign bit.
        // If it is positive, simply convert it to decimal.
        // If it is negative, make it positive by inverting the bits and adding one.
        // Then, convert the result to decimal.
        // The negative of this number is the value of the original binary.

        if ($BinaryValue & 0x80) {

            // negative number
            return (0 - ((~$BinaryValue & 0xFF) + 1));
        } else {
            // positive number
            return $BinaryValue;
        }
    }
}
